package com.atguigu.rabbitmq.four;

import com.atguigu.rabbitmq.utils.RabbitMqUtils;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.ConfirmCallback;

import java.util.UUID;
import java.util.concurrent.ConcurrentNavigableMap;
import java.util.concurrent.ConcurrentSkipListMap;

/**
 * @author: like
 * @Date: 2021/07/18 18:30
 */
public class ConfirmMessage {

    //批量发消息的个数
    public static final int MESSAGE_COUNT = 100;


    public static void main(String[] args) throws Exception {
        //1、单个确认
//        publishMessageIndividually(); ////发布100个，单独确认消息，耗时3894ms

        //2、批量确认
//        publishMessageBatch(); //发布100个，批量确认消息，耗时325ms

        //3、异步批量确认
        publishMessageAsync(); //发布100个，异步确认消息，耗时14ms
    }


    //单个确认
    public static void publishMessageIndividually() throws Exception {

        Channel channel = RabbitMqUtils.getChannel();

        //声明队列
        String queueName = UUID.randomUUID().toString();
        channel.queueDeclare(queueName, true, false, false, null);
        //开启发布确认
        channel.confirmSelect();


        long begin = System.currentTimeMillis();

        for (int i = 0; i < MESSAGE_COUNT; i++) {
            //发消息
            String message = String.valueOf(i);
            channel.basicPublish("", queueName, null, message.getBytes());
            //单个消息就马上进行发布确认
            boolean flag = channel.waitForConfirms();
            if (flag) {
                System.out.println("消息发送成功");
            }

        }

        long end = System.currentTimeMillis();

        System.out.println("发布" + MESSAGE_COUNT + "个，单独确认消息，耗时" + (end - begin) + "ms");

    }

    //批量发布确认
    public static void publishMessageBatch() throws Exception {
        Channel channel = RabbitMqUtils.getChannel();
        //队列的声明
        String queueName = UUID.randomUUID().toString();
        channel.queueDeclare(queueName, true, false, false, null);
        //开启发布确认
        channel.confirmSelect();

        long begin = System.currentTimeMillis();

        //批量确认消息大小
        int batchSize = 10;

        //批量发布确认
        for (int i = 0; i < MESSAGE_COUNT; i++) {
            String message = String.valueOf(i);
            channel.basicPublish("", queueName, null, message.getBytes());

            //判断达到10条消息的时候 批量确认一次
            if (i % batchSize == 0) {
                //发布确认
                channel.waitForConfirms();
            }

        }

        long end = System.currentTimeMillis();
        System.out.println("发布" + MESSAGE_COUNT + "个，批量确认消息，耗时" + (end - begin) + "ms");
    }

    //异步发布确认
    public static void publishMessageAsync() throws Exception {
        Channel channel = RabbitMqUtils.getChannel();
        //声明队列
        String queueName = UUID.randomUUID().toString();
        channel.queueDeclare(queueName, true, false, false, null);

        //开启发布确认
        channel.confirmSelect();

        /*
            线程安全有序的一个hash表 适用于高并发的情况下
            1、轻松的将序号与消息进行关联
            2、轻松批量删除条目 只要给到序号
            3、支持高并发（多线程）
         */
        ConcurrentSkipListMap<Long, String> outstandingConfirms = new ConcurrentSkipListMap<>();


        long begin = System.currentTimeMillis();

        //准备消息的监听器 监听哪些消息成功了 哪些消息失败了
        //消息确认成功，回调函数
        ConfirmCallback ackCallback = (deliveryTag, multiple) -> {
            //2、删除掉已经确认的消息 剩下的就是未确认的消息
            if (multiple) {
                ConcurrentNavigableMap<Long, String> confirmed = outstandingConfirms.headMap(deliveryTag);
                confirmed.clear();
            } else {
                outstandingConfirms.remove(deliveryTag);
            }
            System.out.println("确认的消息：" + deliveryTag);
        };

        /*
          消息确认失败，回调函数
            1、消息的标记
            2、是否为批量确认
         */
        ConfirmCallback nackCallback = (deliveryTag, multiple) -> {
            //3、打印一下未确认的消息都有哪些
            String message = outstandingConfirms.get(deliveryTag);
            System.out.println("未确认的消息是：" + message + "未确认的消息tag：" + deliveryTag);
        };
        channel.addConfirmListener(ackCallback, nackCallback); //异步通知


        for (int i = 0; i < MESSAGE_COUNT; i++) {
            String message = String.valueOf(i);
            channel.basicPublish("", queueName, null, message.getBytes());
            //1、此处记录下所有要发送的消息 消息的总和
            outstandingConfirms.put(channel.getNextPublishSeqNo(), message);
        }


        long end = System.currentTimeMillis();
        System.out.println("发布" + MESSAGE_COUNT + "个，异步确认消息，耗时" + (end - begin) + "ms");
    }
}
